Digital radio communication system, PDMA radio base station reception system and weight vector calculation method

Abstract

When there is a request of extracting a user signal transmitted through a control channel, the weight vector thereof is calculated and stored in a memory. When there is an extraction request of a user signal transmitted through a conversation channel, the weight vector thereof is calculated using the stored weight vector as an initial value. Thus, the calculation time required for the weight vector to converge can be reduced.

What is claimed is:  
     
       1. A radio communication system transmitting a control signal to initiate conversation through a control channel, and transmitting a data signal for conversation through a subsequent conversation channel having a frequency differing from the frequency of said control channel, comprising: 
       reception means including a plurality of antennas for receiving a series of signals constituted by said control signal transmitted through said control channel and said data signal transmitted through said conversation channel from a user,  
       first calculation means for calculating a weight vector of said control signal received through said control channel,  
       memory means for storing said calculated weight vector of said control signal,  
       second calculation means for calculating a weight vector of said data signal received through said conversation channel with the weight vector stored in said memory means as an initial value, and  
       signal extraction means for extracting said data signal according to said calculated weight vector of said data signal.  
     
     
       2. The radio communication system according to  claim 1 , wherein said first calculation means comprises 
       means for calculating a reception signal vector of another user already in conversation using a time slot and a frequency identical to the time slot and the frequency desired by a relevant user,  
       means for producing in a pseudo manner a reception status of a signal in said conversation channel according to said calculated reception signal vector, and  
       means for calculating said weight vector of said control signal serving as said initial value under said reception status produced in a pseudo manner in said control channel.  
     
     
       3. The radio communication system according to  claim 1 , wherein 
       said data signal is formed of a preamble and data, and  
       said second calculation means calculates a weight vector using algorithms different between said preamble and said data.  
     
     
       4. A reception system of a PDMA radio base station receiving from each user a series of signals constituted by a control signal for initiating conversation transmitted through a control channel and a data signal for conversation transmitted through a subsequent conversation channel having a frequency differing from the frequency of said control channel, comprising: 
       a plurality of antennas receiving said series of signals from said each user, and  
       an adaptive array separating a series of signals of a desired user from signals received on said antennas, said adaptive array including  
       first calculation means for calculating a weight vector of said control signal received through said control channel,  
       memory means for storing said calculated weight vector of said control signal,  
       second calculation means for calculating a weight vector of said data signal received through said conversation channel with the weight vector stored in said memory means as an initial value, and  
       signal extraction means for extracting said data signal according to said calculated weight vector of said data signal.  
     
     
       5. The reception system according to  claim 4 , wherein said first calculation means comprises 
       means for calculating a reception signal vector of another user already in conversation using a time slot and a frequency identical to the time slot and the frequency desired by a relevant user,  
       means for producing in a pseudo manner a reception status of a signal in said conversation channel according to said calculated reception signal vector, and  
       means for calculating said weight vector of said control signal serving as said initial value under said reception status produced in a pseudo manner in said control channel.  
     
     
       6. The reception system according to  claim 4 , wherein 
       said data signal is formed of a preamble and data, and  
       said second calculation means calculates a weight vector using algorithms different between said preamble and said data.  
     
     
       7. A weight vector calculation method in a radio communication system that transmits a control signal to initiate conversation through a control channel and that transmits a data signal for conversation through a subsequent conversation channel having a frequency differing from the frequency of said control channel, comprising the steps of: 
       receiving a series of signals constituted by said control signal transmitted through said control channel and said data signal transmitted through said conversation channel from a user using a plurality of antennas,  
       calculating a weight vector of said control signal received through said control channel,  
       storing said calculated weight vector of said control signal,  
       calculating a weight vector of said data signal received through said conversation channel with said stored weight vector as an initial value, and  
       extracting said data signal according to said calculated weight vector of said data signal.  
     
     
       8. The weight vector calculation method according to  claim 7 , wherein said step of calculating a weight vector of said control signal received through said control channel comprises the steps of: 
       calculating a reception signal vector of another user already in conversation using a time slot and a frequency identical to the time slot and the frequency desired by that user,  
       producing a reception status of a signal in said conversation channel in a pseudo manner according to said calculated reception signal vector, and  
       calculating a weight vector of said control signal serving as said initial value under said reception status produced in a pseudo manner in said control channel.  
     
     
       9. The weight vector calculation method according to  claim 7 , wherein said data signal is formed of a preamble and data, 
       wherein said step of calculating a weight vector of said data signal received through said conversation channel comprises the steps of calculating a weight vector using algorithms different between said preamble and said data.  
     
     
       10. A weight vector calculation method in a radio communication system transmitting a data signal formed of signal portions of different contents through a conversation channel within one time slot, comprising the steps of: 
       receiving said data signal transmitted through said conversation channel from a user using a plurality of antennas, and  
       calculating a weight vector using algorithms different between said signal portions of different contents.